A Rod with Resistance R Lies Across Frictionless Conducting Rails

question 45

Multiple Choice

A rod with resistance R lies across frictionless conducting rails in a constant uniform magnetic field B, as shown. Assume the rails have negligible resistance. The magnitude of the force that must be applied by a person to pull the rod to the right at constant speed v is:

• A) 0
• B) BLv
• C) BLv/R
• D) B²L²v/R
• E) B²Lxv/R

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